From the Rolls-Royce experimental archive: a quarter of a million communications from Rolls-Royce, 1906 to 1960's. Documents from the Sir Henry Royce Memorial Foundation (SHRMF).
Blueprint for an improved electrical indicator valve with component details and dimensions.
| Identifier | ExFiles\Box 33\5\ Scan097 | |
| Date | 17th January 1928 | |
| IMPROVED ELECTRICAL INDICATOR VALVE, 4-0, WRAPPED MICA ON, BRASS SPINDLE, MICA WASHERS, STEEL CENTRE, COPPER WASHERS, COMPLETE INSULATOR WITH CENTRE MADE UP BY K.L.G., VALVE GUIDE. Y FIT IN VALVE CENTRE., INDICATOR DISC VALVE, S.L. steel or K.E. 965, STP. 18% TNC., 6 DIA HOLES, AUXILIARY ESCAPE VALVE TO BLOW OUT OILY GASES PRIOR TO OPENING UP TO DISC VALVE, PLUG VALVE (TAPER), STEEL, FINALLY LAPPED IN WITH GRAPHITE, VALVE DETAIL, .5156 DIA., .591 DIA, .187", 3/8" DIA FIT Y, .84", .125, .26, 15° CPS, .04, .42, 2 - 1/8 dia Holes for grinding, 5/16" DIA HOLE DRILLED RIGHT THRU' VALVE GUIDE, 1/16 DIA. ONE HOLE DRILLED THRU' ONE WALL OF VALVE STEM. EDGE OF HOLE IN LINE WITH SHOULDER., VALVE FACES TO BE GROUND IN PLACE, DRG NO. 11929, K.C.Pillar, 17. Jan. '28 | ||